Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b29a68913efd58…

MALICIOUS

PDF

76.9 KB Created: 2021-08-29 11:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bf51dad6724499b9da0fb921ddddc24 SHA-1: 712c7eb8682f52841521786092b2610d23628bc8 SHA-256: 83b29a68913efd589a58890ab0fb8b69412e0543c13484bdf0dbe5636585ef35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d71d5d33c---dawumexar.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8oa7vaidovvc7lev56fhbetrg8/zugoniwurivowuligadibove.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085383c530ec---junawataxo.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/82133352591.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/43524305655.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/meratadupo.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/66316194516.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608880eb00463---wojajegala.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c931fe3413---rukuzoneb.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e8982bd65---tirumotosumuxenutowuv.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/rekiwagaxarogisax.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b34d94ea906---runitarumufopitilogifip.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/753997a609ce753511a52c503493f40e/73467247651.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/bowumumun.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///regovumamapolobebizef.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/delulijelupi.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/beponuzalusi.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/afbad938d53e5ad6d055a9e41814fef8/sidebukiputami.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-8/20210708203049122097.pdfIn PDF document text
    • http://dakmet.pl/upload/21371417339.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/vitosajime.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708daa7f2f0---84200096313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+hunger+games+2+streamingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 10572 bytes
SHA-256: 9ea8d06fb15c83d5b57adb09b84b7a3a577dbe615b7c03479160ec76899a24b3
font_01_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 16984 bytes
SHA-256: 2b953bc46e852776cbd2a352867028d7a56cf60fee2c032fc9588b4bc21bfae8
font_02_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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